Mechanism for forming sheet-metal elbows.



A. DIBGKMANN.

MEGHANISM FOBPORMING SHEET METAL ELBOWS. APPLICATION FILED JAN. 1a. 1906.

Patented Dec'h 5 1911.

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A. DIEGKMANN.

MBGHANISM POR FORMING SHEET METAL ELBOWS.

APPLICATION FILED JAN. 18, 1906.

Patented Decfv, 191-1.

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f7.6- y f I@ i8 Wittmann -I j Cz Y l 55 to ring D, and are moved toward'J and from )UNITED sTATEs PATENT OFFICE.

Anonrn nIEcxMANN, orcmdmmirr, omo.r

. nncmnusm For; romaine SHEET-METAL Ennows.

' Specication of Letters Patent. iApplication ledv January 18, 1906. Serial No. 296,594.

i Patented Dec. 5, 1911.

To all whom itmay concern:

1 Be it known that I, ADOLPH DIECKMANN. a citizen of the nited States, residing at Cincinnati, in the county of Hamilton andm State of Ohio, have invented certain new and. useful Improvements in Mechanism for Forming Sheet-Metal Elbows, of which .the following is a specification.

lMy invention relates to improvements in mechanism for l'orming shectmetal elbows. One of its object-s is to provide improved mechanism for clamping and shaping the elbow bla nk.

Another object is to provide improved means for pressing down the crimps.

Another object is to provides improved mechanism for actuating the above mentioned devices.

It further consists in certain` details of form, combination and arrangement, all of l Y which willY be more Afully set forth in the description of the accompanying drawings, in which; f

Figure 1 is a central vertical longitudinal Section through my improved mechanism.

Fig. 2 is` a section on linen' of Fig. 1,

showing one of the clamping and shaping mechanisms in plan view. Fig. 3 is a plan or endview of the other or movable clamping and shaping mechanism. Fig. 4 is a lan view of the crim forming mechanism. f ig. 5 is a side elevatlon of the mandrel detached.A Fig. 6 is a central vertical section through a .modified clamping' and shaping mechanism.

Iii-the accompanying drawings A represents-a frame or base having an arm A to which is secured a hollow mandrel B. The

forward end ofthis mandrel is corrugated at B or otherwise shaped to correspond to the outline or shape to be imparted to the elbow. The sheet metal or blank from which the elbow is to' be formed is first formed into a cylinder C with overla ping edges, which cylinder or tubeis slipp over the mandrel. rIhe inner edge of the tube rests against a Aring o by means of which the tube is fed forward on the mandrel after each radial crimp is formed. Y.

:D represents a ring or frame supported by "the base andY encircling the forward or free end of the mandrel. Projecting inwardfrom ring D are a series of presser feet or clamping jaws E, which as shown in F2' 1 and 2 are attached by slots e and gui es d the mandrel by mea-ns of'links F G pivoted to the feet and ring respectively at g f, said links being'pivoted to each other by pins f. Rings H Hy are clamped together by screws L and move together relative to ring D, journaling on the inner face thereof,l The pins f also engage slotted openingsy 7L rim` rings H H so that movement of rings H H relative to ring D serves to bring the centers f f g into line, thereby forcing the feet against the mandrel, or by movement in the opposite direction, to move the feet away from the mandrel. Fig-12 show s the feet Yclamped upon the mandrel and Figp shows the position ofv the parts when they are retracted.

I represents a worm which may be turned by a hand lever J or otherwise operated.. and K a segment-fof a worm wheel carried by ring H to engage and\ be driven by said worm. The feet-E serve to clamp the cylinder to the end of the mandrel and to cause it to conform to thel shape of the mandrel.

mandrel N of the same external outline as the forward end of mandrel B. Core N is heldin place relative to the mandrel'by a l Y projecting tongue n seating in a recess therein, Between the core N and the end of the mandrel is a. crimp 'former Q composed of a series of sections o', the upper and side a sections of which maybe moved outwardly as indicatedin Figs. 1 and'4 by means of a polygonal wedge P carried by rod p. The expan g of sections o serves to forma radial crimp Q in the blank C between the "ring or core N and the end of the mandrel,

said crimp being of greater depth at the top. The sections o are held together by ring O to whichk they are secured by screws passing through slotted openings.

Rod 77 maybe shifted by means of a. hand lever pl pivoted at p tothe rear end of the mandrel, `and to which rod p is attached. After the sections o have formed crimp Q and have ,been retracted ther parts M N are shifted on center l 'causing the inclined lfaces e m of feet E M to press the faces 'g g of crimp Q, together between said -inclinedfaces, thereby closing up said crimp and forming a fractional bend or curvature of the blank due to the metal taken up on one sideto form the crimp. The feet E M are then retracted and the blank C fed forward on the mandrel to a point where it is desired to form the next crimp. When the feet M again clamp the blank', the last formed crimp is forced downthereby upon the face of the blank 'as indicated in Fig. 1. If the shanks C of the elbow are longenough to require it, the feet E are pressed thereon to give them the same cross sectional pattern as the body of the elbow, so that the elbow will have the same pattern throughout. The lower sect-ion o of the crimp former rests on the tongue n of the mandrel.

In the modification Fig. 6 the respective feet 2 are supported in a ring or frame 3 by means of pistons or plungers 4 working in cylinders 5 formed in said` frame. The feet are clamped upon the blank and retracted by means of fluid pressure. 6 and 7 represent ports leading to opposite ends of the respective cylinders from a two way cock 8, which may be turned to admit fluid pressure to either end of the several cylinders, and to exhaust from the opposite end of said cylinders. 9 represents the mandrel, 10

the blank clamped thereon, and 11 piston rods connecting the feetA with the plungers. A. single two way cock may be employed to operate both series of feet.

The number of feet may be varied as required by the pattern of the mandrel or other considerations. In Fig. 2 I have shown eight feet and in Fig. 6 only four. With the mechanism herein shown I am enabled to form the radial crimps and the cross sectional pattern at a single operation.

The mechanism herein shown is capable of considerable modification without departing from the principle of my invention.

Having described my invention, what I claim is;

1. In a mechanism of the character indicated, a mandrel, a frame encircling the free end of said mandrel, a crimp former at the end of said mandrel, and a series of feet carried byA said frame and adapted to be projected against and retracted from said mandrel to clamp the elbow blank to the vmandrel during the formation of the crimp.

2. In a mechanism of the character indicated, a mandrel, a crimp former at the free end of said mandrel, a frame encircling the free end of said mandrel, a series of feet carfried by said frameand adapted to beV projected against and retracted 'from said mandrel to cl/anp'the elbow blank to the mandrel during the formation of the crimp,

and means for; simultaneously actuating.4

` the elbow blank respectively .to the mansaidl feet.

3. In a mechanism of the character indi- `cated, a mandrel, having an irregular eX- elbow, a; crimp former at the free end 'of said mandrel, a frame encircling the free end of said mandrel, a series of feet carried by said frame and adapted to be yprojected against and retracted from said mandrel to clamp the elbow blank to the mandrel durj ing they formation of the crimp.

4. In a mechanism of the character lindicated, a mandrel, a crimp former located at the free end of said mandrel, a secondary movable mandrel" located on the opposite side' of said crimp former, frames encircling said mandrel and secondary mandrel, one of said frames moving pivotally relative to the other, a series of feet projecting inwardly from each of said frames to clamp the elbow blank respectively to the manldrel and secondary mandrel, and means for simultaneously actuating the respective series-of feet: y

5. In a'mechanism ofthe character indicated, va mandrel having an exteriory of the pattern which it is desired to impart to the elbow, a crimp former at the free end of said mandrel, a series of feet supported about said mandrel by a frame, said feet having inclined faces at the end adjacent to the crimp former, and their faces adjacent to the mandrel fitted to the pattern thereof, and means for simultaneouslyA actuating said feet. l

6. In a mechanism of the character indicated, a mandrel, a crimp former at the free end of saidV mandrel, a frame encircling the free end of said mandrel, a series of feet connected to said frame by links, a ring journaled and adapted to move relative to said frame, and connections between said ring` and the links of the respective feet,

segment carried by said ring in mesh with' said worm. Y

8. In a mechanism of the character indicated, a mandrel, a crimp former at the free end of said mandrel, a secondary movable mandrel locatedon the opposite side of said .crimp former, frames encircling said man- 'drel and secondary mandrel, one of said frames moving pivotally relative to the other, separate seriesof feet projecting inwardly from each of said frames to clamp drel and secondary mandrel, links connectv ing said several feet to the respective frames, rings journaled relative to said I frames and connected to said links so that the movement of said rings .serves to si.-

`multaneously actuate the feet attached to the respective frames. E j

9. In a mechanism of the character. indicated, a mandrel, a crimp former at the free end of said mandrel, aseriesof feet movable in a radial direction'to and from said inandrel to clamp the blank thereto, a secondary movable mandrel located on the@ opposite side of said crimp former, the exterior of said secondary mandrel being the saine that is to be imparted to the elbow, anda series of feet movable in a radial direction toandfrom said secondary mandrel to lay down the crimps and shape the crimped portion of the elbow to the pattern of said secondary mandrel.

`10. ln a mechanism of the character indicated, a mandrel, acriinp former atthe free end of said mandrel, a series of feet movable in a radial direction to and from said mandrel to clamp the blank thereto, a detachable secondary movable mandrel located on the opposite side of'said crimp former,

the exterior of said ysecondary mandrel 'oeing the same that is to be imparted to the elbow,'and a series of feet movable in a radial direction to and from said secondary mandrel to laydown the crimps and shapev the crimped portion of the elbow to the pattern of said seco-ndary mandrel.

11. in a machine for making sheet metal pipe elbows the combination of a stationary corrugated die, a correspondingly corrugated swinging die, radially movable bulging dies, means foi-"projectingsaid bulging dies outwardly between the stationary and swinging dies when'they are separated, dies surrounding the stationary and swinging dies land tting the corrugations therein, the

`side, radially movable bulgin dies surrounding the swinging die beingmovable radially toward and from thesame and capable of swinging therewith toward and from the stationary die, means Jor moving the dies surrounding, the swinging die radially, and means for moving the swinging die with' the associated surrounding dies toward the stationary die when the bulgingl dies are withdrawn inward, substantiallyas described.

l2. In a machine .forinalting sheet metal pipe elbows the combination of a stationary corrugated die, a correspondingly corrugated swinging die pivotally connected therewith adjacent to onesideand movable toward and from the saineon the opposite dies, means for projecting said bulging dies outwardly between the stationary and swinging dies when they are separated, dies surrounding the stationary and swinging dies and fitting the corrugations therein, their opposing faces adjacent to the bulging dies being correspondingly beveled and the diessurroundg tially as described.

ing the swinging die being movable radially toward and from the same and capable of swingingt-herewth toward and from the stationary die, means for moving the dies surrounding the swingingdie radially, andA means for moving the swinging die with the associated surrounding dies toward the stationary die when the bulging dies are withdrawninward, substantially as described. 13. In a machine for making sheet metal pipe elbows the combination ofa hollow stationary corrugated die, a correspondingly corrugated wedge shaped swinging diepiv-A otally connected adjacent toits thicker side witlithe stationary die,jlongitudin`al1y andv radially movable bulgin diesv mounted in said hollow die, -ineans or projecting said ,bulging dies outwardlyy between the stationary and swinging dies when they are separated, dies surroundinr the stationaryl andswinging dies and fitting the corrugations therein, their opposing faces adjacent to the bulging dies being correspondingly beveled and the dies surrounding the swinging die being movable radially toward and from the same and` capable of swinging therewith toward and from the stationary die, ineansl for moving the dies surrounding the swinging die radially, and 'means for niovingthe swinging die with the associated surrounding dies toward thel stationary die when the bulging dies are withdrawn into it, substanf la. in a machine orinaking corrugated elbows, the combination oi' means for progressively forming longitudinal' corrugations in a pipe section, means for successively pressing transverse bulges at intervals in one s de of the corrugated part of the pipe,

ltially as described.

i6. In a machine. for making corrugated elbows the combinationof corrngating heads .or dies arranged one within the other, means for feeding a pipe section step by step between said heads, a pivoted head movable toward and from the corrugatingbeads and provided withradially movable jaws, connections for operating said pivoted head and its jaws, bulging dies movable radially out vand-in between the free side of the pivoted head and the inner corrugating head, and means for operating said bulging dies, substantially as described.

ai j

17. In a machine for making corrugated elbows the combination of corrugating heads or dies arranged one within the oth'er, means for eedinga pipe section step by step between said heads; a pivoted head movable toward and from the corrugating heads and provided with radially movable jaws; a clamping die pivoted to the inner `corrugating head within the opening of the pivoted head, connections for operating said pivoted head, jaws and die; radially movable bulging dies, and means for intermittently mov-k ing said bulging dies outwardly between and beyond the clamping die and inner corrugating head, substantially as described.

18. In a machine forl making corrugated' elbows the combination of corrugating heads arranged one within the other, 4the outer head being provided with radially movable dies, means for moving said dies n and out,

- means for feeding a pipe section intermittent-lystep by step between said heads when said dies are closed, a ivoted head. adapted to swing toward and rom the corrugating heads and provided with radially movable 'aws, connections for operating said pivoted ead and jaws, radially movable bulging dies'between the inner corrugating head and the pivoted head, and means for intermittently thrusting said dies outward beyond the inner corrugating head, substantially as described. j

19. In a machine for making corrugated elbows, the combination of inner and outer corrugating heads, means for feeding) a pipe section intermittently step by step etween said heads, a swinging head at the delivery side of the corrugating heads provided with an inner clamping die and with radially movable jaws, means for. intermittently moving said jaws in and out toward and -from the clamping die, radially movable bulging dies carried by the inner corrugating head, and a head movable axially within the inner corrugating head and adapted when moved in opposite directions to project -and withdraw said bulging dies, substantially as described.-

20. In a machine for making corrugated elbows, the combination of corrugating heads arranged one within the other, the

outer' corrugating head having radially movable dies and the dies on one .side of said s head having beveled ends, means for intermittently feeding a pipe section between said heads, a pivoted head movable toward and from the corrugating heads and ,rovided with radially movable jaws, the. jaws on one side of said head having their ends beveled in the same direction as the opposing beveled ends of the dies of the outer corrugating head, means for intermittently moving said jaws in and out, radially movdies, means for moving the outer dies towardl vand from the inner fixed die, means for feeding'a pipe on saidmandrel step by step between said corrugating dies, a wedge shaped clamping die pivoted on the thicker lside to the fixed corrugating die and having its curved face correspondingly corrugated, a pivoted head arranged to swing toward 'and from said stationary head and provided with jaws movable radially toward and from said clampingzdie 4and havin correspondingly shaped faces opposed t creto, means for intermittently swinging said clamping die and pivoted head toward and from the corrugating dies, radially movable bulging dies of gradually diminishing thickness from vthe narrower toward the thicker side of the clamping die, and means for intermittently projecting said bulging dies between `the clamping die and xed corrugating die, the opposing ,ends of the movable corrugating dies and of the clamping jaws adjacent to the bulging dies being beveled or inclined outwardl toward the stationar corrugating head, su stantially as describe In testimony whereof I have affixed my signature in presence of two witnesses.

ADoLPH DIECKMANN.

Witnesses:

CHARLES J. INo'rr, AGNES MCCORMACK.

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